linux-kernel - Re: [PATCH] Smackv10: Smack rules grammar + their stateful parser

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Message-ID: <20071105094007.GA19367@ubuntu>
Date:	Mon, 5 Nov 2007 11:41:25 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Casey Schaufler <casey@...aufler-ca.com>, akpm@...l.org,
	torvalds@...l.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>
Subject: Re: [PATCH] Smackv10: Smack rules grammar + their stateful parser

On Sun, Nov 04, 2007 at 12:28:48PM +0000, Pavel Machek wrote:
> Hi!
> 
> > > Still to come:
> > > 
> > >   - Final cleanup of smack_load_write and smack_cipso_write.
> > 
> > Hi All,
> > 
> > After agreeing with Casey on the "load" input grammar yesterday, here's
> > the final grammar and its parser (which needs more testing):
> > 
> > A Smack Rule in an "egrep" format is:
> > 
> > "^[:space:]*Subject[:space:]+Object[:space:]+[rwxaRWXA-]+[:space:]*\n"
> > 
> > where Subject/Object strings are in the form:
> > 
> > "^[^/[:space:][:cntrl:]]{1,SMK_MAXLEN}$"
> 
> Can we avoid string parsers in the kernel?
> 

Ok, Could someone suggest a better idea please ?. 

I thought about packing the rules in a structure and sending
it over an ioctl() command. Is this applicable ?

> 
> > +static inline int isblank(char c)
> > +{
> > +	return (c == ' ' || c == '\t');
> > +}
> 
> This sounds like enough for 'NAK'.
> 
> 						Pavel,
> 		who still thinks smack rules should be parsed
> 		in userspace and compiled into selinux rules...
> 		
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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